Compound for use in tinning-baths.



NrTnD STATES Patented August 11, 1903.

PATENT OFFICE.

ARTHUR W. BURWELL, OF CLEVELAND, OHIO, ASSIGNOR TO ELMER A. SPERRY,AGENT, OF CLEVELAND, OHIO.

COMPOUND FOR USE IN TlNNlNG-BATHS.

SPECIFICATION forming part of Letters Patent No. 735,941, dated August11, 1903.

Application filed December-'3, 1900.

To all whom it may concern.-

Be it known that I, ARTHUR W. BURWELL, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a new and useful Compound for Use in Tinning-Baths, of whichthe following is a specification.

My invention relates to an oleaginous co mpound or oil fortinning-baths; and'it consists in a mechanical mixture of substanceswhich have been found to possess in a high degree all the qualitiesnecessary or desirable in what may be termed a fluxing luster-oil. Theoffice and purpose of such an oil is, first, to enable the temperatureof the molten tin to be transmitted to the plate for a considerableperiod after the plate has left the surface of the tin and during whichit is being drawn upwardly through the mass of oil, the density of whichbeing only about one-tenth allows the tin while yet in a perfectlymolten state to easily flow downwardly off the sheet. This isaccomplished without deposit of carbonaceous material on the surface ofthe plate only by an oil or compound of high fire test. Secondly, it isfound that the oil must have certain qualities, known as fluxingqualities, whereby the tin is made to adhere in a more uniformand muchthinner layer to the surface. Thirdly, while it may have fluxingqualities and be of high fire test, yet it is often found that the tinwill appear dull and with insufficient luster and brightness. It must,therefore, be a lusteroil or a compound which develops a high degree offinish and luster. Fourth, the oil or compound of materials must be suchthat it will not quickly freeze upon the surface of the tin, and thus bewasted, and require mechanical removal before the tin is suitable forthe market. This last quality is found to be determined by or related insome manner to the chill test of the compound.

The following compound is found to possess all of the above qualities ina marked degree, and consists in a mechanical mixture of mineral oilhaving a boiling-point above that of molten tin-such, for instance,

Serial No. 38,531. (No specimens.)

as a goodquality of cylinder stock, (which has a specific gravity ofabout 30 Baum or below, (produced in the last stages of mineraloilrefining-with an unsaturated fat-acid, such as free oleic acid or amixture containing free oleic acid, preferably a mixture of palmitic,stearic, and free oleic acids, and preferably rich in the last -.namedacid. These materials I prefer to mix while in the heated or moltenstate, although this mixture might be made in all probabilty while theyare cold with proper apparatus. These materials I have mixed and testedin various proportions; but I have'found about twothirds of the mineralstock with one-third of the acid to give excellent results, although Ido not wish to be limited to this proportion or ratio of ingredients,nor do I wish to be restricted to the exact methods herein described.

I am aware that terne and tin plates have been treated with a compoundcomposed of olive, linseed, petroleum, and palm oils; but my compound isdistinguished therefrom by the fact that it is free from drying-oils andis therefore not a compound which will adhereto the plates as aprotecting-coating.

What I claim as new, and desire to secure by Letters Patent, is-

1. A combined fluxing and luster oil for tinning-baths consisting ofnon-drying ingredients comprising a mineral oil having a boiling-pointabove the temperature of molten tin and a material rich in free oleicacid.

2. A combined fluxing and luster oil for tinning-baths, consisting ofnon-drying ingredients comprising a mineral oil having a boiling-pointabove the temperature of molten tin, and palmitic, stearic, and freeoleic acids.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ARTHUR W. BURWELL.

Witnesses:

ELMERA. SPERRY, D. T. DAVIES.

